Compare supplements side by side on Amazon. Price per capsule, per serving, per 100mg — and a single Best Buy verdict.
No account required · Works on amazon.com, amazon.co.uk, amazon.com.au and more
How it works
No spreadsheets, no manual maths. The extension does the work while you browse.
Visit any supplement product page on Amazon. An Add to Supplement Compare button appears automatically below the Buy Now button.
Click the button on each product you want to compare. Add as many as you like — the extension collects all the data in the background.
Open the comparison view. Every metric calculated, every product ranked. One clear winner — with the reasons why.
What gets compared
Not just price. Real value — broken down the way you need it.
The most honest measure of value. How much does each individual capsule actually cost?
Accounts for serving size differences — because two capsules vs one changes everything.
Compare across different dosages fairly. The only way to know if a higher-dose product is actually cheaper.
A weighted algorithm weighs all metrics and picks one winner — with clear reasons why.
Comparing UK and AU listings? Live exchange rates via Stripe FX normalise prices automatically.